Mixed-pulp product and process of making the same



Feb. 1925. 1.525050 I w. H. SAVERY MIXED PULP PRODUCT AND PROCESS OF MAKING THE SAME Filed March 25. 1922 2 Sheets-Sheet 1 Feb. 3, 1925. 1,525,050

' W. H. SAVERY MIXED PULP BRODUCT AND PROCESS OF MAKING THE SAME Filed March 25, 2f 2 Sheets-Sheet 2 Patented Feb. 3, 1925.

UNIT-ED STATES WILLIAM H. SAVERY, OF WILMINGTON, DELAWARE. v

MIXED-PULP PRODUCT AND PROCESS OF MAKING THE SAME.

Application filed March 25, 1922. Serial No. 546,81 4.

To all whom it may concern:

Be it known that I, WILLIAM H. SAVERY, a citizen of the United States, residing at Wilmington, in the county of New Castle and State of Delaware, have invented certain new and useful Improvements in Mixed- Pulp Products and Processes of Making the Same, of which the following is a specification, reference being had therein to the accompanying drawing.

This invention relates to an improved mixed pulp product and processof making the same, the product being useful for various grades of papers, such as hanging, toweling, tissue papers, as well as news and similar grades, wrapping or bogus manillas, and other purposes, such as paper and pulp boards, container board and building paers. p The object of the invention is to provide an improved method of making mixed pulp which can be practiced at considerably less expense than present day methods, requirin less machinery and power, and which wil materially reduce the time required in pulping and the cost of production.

A further object of the invention is to provide an improved method by which the strong fiber material will be properly softened, the fibers separated, and intermixed.

with the ground wood under conditions that result in a more thorough, uniform bringing together and combining of the ground wood with the fiber material, and the making of a superior product.

The invention, with other objects and advantages thereof, will' be understood from the hereinafter contained detailed description, when considered in connection with the accompanying drawings, forming part hereof and wherein is illustrated one form of apparatus for carrying out my improved method.

- In the drawings:

Figure 1 is a side elevation of an apparatus constructed in accordance with the present invention, certain of the parts being shown in section and others illustrated diagrammatically.

Figure 2 is a part side elevation and sectional view on an enlarged scale, of the main portion of the apparatus.

The invention comprehends utilizing the heat evolved by friction in the process of grinding wood pulp to melt, dissolve or reduce a portion of the fibrin or glutenous matter, which binds the fibers together in the natural state of the wood, and while this glutenous matter is hot and sticky, like glue, to combine with the wood pulp so treated, the other fiber material, the latter, such as sulphite fiber or -waste paper, prior to the mixing, being treated to disentangle or separate the fibers. The invention contemplates the production of strong fiber material, treated to soften the same and to separate the fibers, during the wood grinding operation as a part of the said operation,

in certain proportions to the quantity and rate of production of the ground wood, and the mixing of the treated, strong fiber material and the ground wood or wood pulp in the presence of heat and moisture at the time the ground wood is produced, the grinding, separation of the strong fiber material and mixing operations being acontinuous process. The expression stron fiber material or fiber material, it wi be understood, is used herein and in the appended claims as a broad term for the various kinds of material suitable for mixing with the ground .wood, any of which may be used separately or together in the method, including sulphite fiber, sulphate fiber, chemical fiber, kraft fiber and waste papers of various kinds, as folded news, over tissues, side rolls or waste news, either white, colored or printed, old magazines, wrapping papers, etc., and other forms of waste paper.

In practicing the method, wood is reduced by grinding in the usual way. The strong fibermaterial is preferably thoroughly soaked with water and in a wet softened condition continuously fed and presented under pressure to a moving roughened surface which acts to: separate and gently disentangle the fibers. The treated fiber material is maintained in a thoroughly wet condition byv adding additional water, or by steaming the same, when considered necessary, and thus conditioned the treated fiber material and the ground wood, as produced, are brought together and thoroughly mixed in the presence of heat, the separating and grinding processes being performed at the same time and so regulated that the treated fiber and ground wood are continuously produced in certain amounts to obtain the desired proportion of the two or more materials in the mixture. While, as above stated, the strong fiber material is preferably treated with water. to soften the same, under certain conditions the same may be used in a substantially dry state.

The pressure and feeding of the strong fiber material against the moving roughened surface to disentangle the fibers is properly regulated to meet this changed con= dition and avoid overheating. The mixed product is withdrawn from the wood grinder and conveyed to suitable mechanism for forming the same into sheets, rolls, or any other desired shape. Prior to its delivery to the forming mechanism, any suitable coloring, sizing, or dyeing materials may be introduced into the mixed pulp.

The particular apparatus illustrated in the drawings, for carrying out my improved method, includes a rotating cylindrical grinding roll 1 of sand stone or the like fixed upon a shaft 2 supported for rotation in bearings 3 on the casing 4, the latter being secured to a suitable base 5 above the receiving trough or tank 6. Any suitable driving connection, not shown, may be employed for the shaft 2. 7 designates cells or pockets for the wood, the cells or pockets being equipped with sliding doors 8 and followers 9, and with hydraulic cylinders 10 for operating the same, the construction so far described being one of the well known conventional types of wood grinders.

In accordance with the present invention, the wood grinder is provided or has associated therewith means for feeding the strong fiber material to the cylindrical grinding roll 1. In the particular exemplification shown in the drawings, said feeding means is located in advance of the cells or pockets 7 for the wood. The means for this purpose, illustrated in the drawings, takes the form of cells or pockets 11, which are socured to the casing 4 and arranged relatively to the grinding roll 1 similar to the cells or pockets 7. The cells or pockets 11 for the strong fiber material are provided with followers 12 operated by hydraulic or air pressure cylinders 13, or other suitable means. The cells or pockets 11 have feeding threats or hoppers 14, and located over the hoppers 14 are water or steam sprays 15. 16 designates a water or steam spray pipe extending transversely of and adjacent the grinding roll 1 between one of the fiber material pockets 11 and one of the wood pockets 7. Suitable connections, not shown, are provided whereby hot or cold water, or steam may be supplied to the sprays 15 and 16. 17 designates a conduit leading from one end of the tank or trough 6 to the screen box 18. 19 is a pump in the conduit, and 20 designates pressing and shaping rolls, all of well known construction and only illustrated diagrammatically in a general way.

For the purpose of introducing coloring matter or dyeing materials into the mixed pulp, a dye container and mixer 21 is provided. This container, which may be of any approved construction, has'a discharge pipe 22 communicating with the screen box 18.

In the operation of the apparatus the pockets 7 and 11 are charged respectively with wood and strong fiber material. The reduction of the wood takes place substantially in the usual way. As the fiber material, preferably wet or moist, is continuously fed to the grinding roll 1, the roll acts to gently disentangle and separate the fibers, and carries the separated material forward to and beneath the wood grinder, thoroughly mixing the ground wood and treated fiber material together. The mixing takes place in the presence of heat generated by the grinding of the wood, and in the presence of moisture, the fiber material preferably being kept soaked with water, both prior to and after the separating processes,

by the sprays 15 and 16.

As will be understood, there is a mixing of the two kinds of fiber substantially at or near to the point of reduction of the wood by the grinding roll. A certain agitation and treatment is also effected by the action of the stone or grinding roll 1, working or wallowing in the warm pulp as it accumulates in the tank or trough 6.

As will be understood, by simply determining before hand what percentage of any fiber is required, and then adding that special or specific fiber by feeding the same to the grinding roll, any desired mixture can be produced. While in the particular form of apparatus illustrated in the drawings, two Wood pockets 7 and two fiber material pockets 11 are shown, the latter having substantially the same discharge area as that of the wood pockets, any desired number and combination of wood and fiber material pockets and of varying sizes may be em ployed to suit different conditions and to obtain different proport'ons of the ground wood and fiber material in the mixture.

As will be appreciated, the method hereinbefore described greatly reduces the time and cost of production.- The usual beating room, beating and mixing machines, and the required power therefor, are entirely eliminated. Furthermore, the output of the wood grinder is materially increased with practically no additional outlay of power; that usually required to run the wood grinder in the ordinary wood grinding operation being suflicient, only a relatively small amount of power being required to reduce wet or moist papers to a pulp.

It will be noted that a very thorough and uniform commingling of the separated fiber material with the ground wood is effected, the union or combining of the separated fiber material with the ground wood taking place under ideal conditions therefor, in the presence of heat and moisture, the resulting product being of a much superior nature to the mixed pulp as commonly produced.

What I claim is 1. The method of mixing pulp consisting in subjecting ground wood to heat to melt a portion or all of theglutenous matter which binds the fibers'of the wood together in the natural state of the wood, and' while the glutenous matter of the ground Wood pulp 1s hot and sticky, mixing with the ground wood pulp other fiber material.

' 2. The method of mixing pulp consisting in subjecting ground wood pulp to heat to melt a portion or all of the glutenous matter which binds the fibers of the wood together in a natural state, and while the glutenous matter of the ground wood pulp is hot and sticky, mixing with the ground wood pulp other fiber material having its fibers in a separated condition.

3. The method of mixing pulp consisting in subjecting ground wood pulp to heat to melt a portion or all of the glutenous matter which binds the fibers of the wood together in a natural state, and while the glutenous matter of the ground wood pulp is hot and sticky, mixing with the ground wood pulp other fiber material having its fibers in a separated condition, and subjecting the mixture to agitation. Y

4:. The method of mixing pulp consisting in reducing wood by grinding, carrying on the wood grinding process so that the glutenous matter that binds the fibers of the wood together in the natural state of the wood will be melted by heat evolved by friction in the grinding operation, and while the glutenous matter of the ground wood pulp is hot and sticky, mixing with the ground wood pulp other fiber material.

5. The method of mixin pulp consisting in reducing wood by grin ing, carrying on the wood grinding process so that the glutenous matter that binds the fibers of the wood together in the natural state of the wood will be melted by heat evolved by friction in the grinding operation, and while the glutenous matter-of the wood pulp is hot and sticky, mixing with the wood pulp so treated other fiber material having its fibers in a separated condition. 1 v

6. The method of making mixed pulp consisting in subjecting paper saturated with water to the action of a moving roughened surface to separate the fibers of the paper, and then mixing therewith ground woo-d heated so that glutenous matter of the ground wood pulp is in a. hot and sticky condition.

7 The method of making mixed pulp consisting in subjecting paper saturated 'with water to the action of a moving roughened surface to separate the fibers, simultaneously reducing wood by grinding, and carrying on the wood grinding process so that the glutenous matter that-binds the fibers of the wood together in the natural state of the wood will be melted by heat evolved in the grinding operation, separating processes progress, and while the ground wood is in a heated condition with glutenous matter thereof hot and sticky, mixing together the ground wood and the treated paper.

8. The improved combined pulp product resulting from mixing fiber material with round wood while glutenous matter of the ground wood is in a hot and sticky condition.

9. The improved combined pulp product resulting from mixing fiber material with its fibers in a separated condition with ground wood while glutenous matter of the ground wood is in a hot and sticky condition.

10. The improved combined pulp product -made' by mixing paper with ground wood in a heated condition with glutenous matter of the wood hot and sticky.

11. The improved combined pulp product made by mixing paper having its fibers in a separated condition with ground wood in a heated condition with glutenous matter thereof hot and sticky.

In testimony whereof I hereunto aflix my signature in the presence of two witneses.

GEo. D. RILEY, GERTRUDE Wnbnmnrnn.

and as the grinding and 

